Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1995-11-27
1997-03-25
Hellner, Mark
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359153, 379 59, H04B 1008
Patent
active
056150342
ABSTRACT:
An optical micro cell transmission system comprising a radio base station, at least one optical interface section connected to the radio base station, and an optical forward base station connected to the optical interface section via optical fibers for transmitting and receiving signals through an antenna, and being flexible for the variation of an amplifier due to a change in temperature or a change in the length of an optical segment, and also being available for detecting faults in the optical forward base station is provided. Pilot signal generators 30, 51 are provided for generating pilot signals. For a transmitted signal 11, a coupler 21 in the optical interface section convolutes a pilot signal P.sub.D, and a demodulator 48 in an optical forward base station detects the level of the pilot signal P.sub.D and controls a downward signal amplifier 42 according to the result of detection. For a received signal received by an antenna 6, a coupler 45 in the optical forward base station convolutes a pilot signal P.sub.U, a demodulator 27 in the optical interface section detects the level of the pilot signal P.sub.U and controls an upward signal amplifier 25 according to the result of detection. Furthermore, control signals and fault information signals are transmitted in a modulated signal for the pilot signals P.sub.D, P.sub.U.
REFERENCES:
patent: 5150243 (1992-09-01), Suzuki
patent: 5278690 (1994-01-01), Vella-Coleiro
patent: 5301056 (1994-04-01), O'Neill
patent: 5479595 (1995-12-01), Israelsson
patent: 5493436 (1996-02-01), Karasawa et al.
Hellner Mark
NEC Corporation
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